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alink ="#0000ff ">
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< H1 > Frequently Asked Questions (FAQ) for PostgreSQL</ H1 >
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- < P > Last updated: Mon May 26 15:25:04 EDT 2003</ P >
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+ < P > Last updated: Wed May 28 00:35:16 EDT 2003</ P >
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< P > Current maintainer: Bruce Momjian (< A href =
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"mailto:pgman@candle.pha.pa.us "> pgman@candle.pha.pa.us</ A > )< BR >
@@ -83,7 +83,7 @@ <H2 align="center">Operational Questions</H2>
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< A href ="#4.1 "> 4.1</ A > ) What is the difference between binary
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cursors and normal cursors?< BR >
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< A href ="#4.2 "> 4.2</ A > ) How do I < SMALL > SELECT</ SMALL > only the
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- first few rows of a query?< BR >
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+ first few rows of a query? A random row? < BR >
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< A href ="#4.3 "> 4.3</ A > ) How do I get a list of tables or other
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things I can see in < I > psql</ I > ?< BR >
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< A href ="#4.4 "> 4.4</ A > ) How do you remove a column from a
@@ -799,7 +799,7 @@ <H4><A name="4.1">4.1</A>) What is the difference between binary
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description.</ P >
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< H4 > < A name ="4.2 "> 4.2</ A > ) How do I < SMALL > SELECT</ SMALL > only the
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- first few rows of a query?</ H4 >
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+ first few rows of a query? A random row? </ H4 >
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< P > See the < SMALL > FETCH</ SMALL > manual page, or use
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< SMALL > SELECT</ SMALL > ... < SMALL > LIMIT</ SMALL > ....</ P >
@@ -811,6 +811,14 @@ <H4><A name="4.2">4.2</A>) How do I <SMALL>SELECT</SMALL> only the
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records requested, or the entire query may have to be evaluated
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until the desired rows have been generated.</ P >
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+ < P > To < SMALL > SELECT</ SMALL > a random row, use:
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+ < PRE >
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+ SELECT col
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+ FROM tab
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+ ORDER BY random()
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+ LIMIT 1;
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+ </ PRE >
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+
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< H4 > < A name ="4.3 "> 4.3</ A > ) How do I get a list of tables or other
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things I can see in < I > psql</ I > ?</ H4 >
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